用Dialog实现列表对话框

private void show4(){    AlertDialog.Builder builder=new AlertDialog.Builder(this);    builder.setTitle("部门列表");    builder.setIcon(R.drawable.ic_launcher);    builder.setItems(item,new DialogInterface.OnClickListener() {@Overridepublic void onClick(DialogInterface dialog, int which) {// TODO Auto-generated method stubToast.makeText(MainActivity.this,"我动了"+item[which],Toast.LENGTH_LONG).show();}});    AlertDialog dialog=builder.create();    dialog.show();    }